Our dryer quit working a couple weeks ago (wouldn't tumble). We looked at having it repaired but, living in the DC area, you might as well just have someone come mug you in the parking lot. These guys charge obscene labor rates!
After looking at a couple YouTube instructional vids (google something like "repair Whirlpool dryer"), I realized it was fairly simple: all you need is a new dryer drum belt. The thing is 78 cents on Amazon (plus shipping). Had it here in a couple days, took the dryer apart by removing 4 screws, and had the new belt on in a matter of minutes, referring to the old dude on YouTube on my laptop. Saved a ton of $$$. Badass!